Modeling the Effects of Ion Viscosity on the Dynamics of OMEGA Direct-Drive Cryogenic Implosions

ORAL

Abstract

The hot-spot--ignition concept in inertial confinement fusion utilizes laser-driven implosions of spherical shell targets with DT ice as a fuel. Estimates of the physical conditions before and during the formation of the center hot spot in OMEGA-scale implosions reveal that the Knudson number can approach unity in the low-density interior of targets, indicating the potential importance of kinetic effects. To investigate these effects, cryogenic OMEGA implosions were simulated using the 3D hydrodynamic code ASTER, which includes the ion viscosity model assuming the Spitzer ion free path. The dependences of simulations results on the exact implementation of the viscosity model, including the effects of momentum and heat-flux limitations and using the energy conservation scheme, are studied. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.

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Authors

  • Iogr Igumenshchev

    • Laboratory of Laser Energetics
    • Laboratory for Laser Energetics
    • Laboratory for Laser Energetics, University of Rochester
    • Lab for Laser Energetics

  • Owen Mannion

    • Laboratory of Laser Energetics
    • Laboratory for Laser Energetics, University of Rochester
    • University of Rochester
    • Lab for Laser Energetics

  • James Knauer

    • Laboratory for Laser Energetics, U. of Rochester
    • 4Laboratory for Laser Energetics
    • Laboratory for Laser Energetics
    • LLE-UR
    • University of Rochester
    • Lab for Laser Energetics

  • R. Betti

    • Laboratory for Laser Energetics, U. of Rochester
    • LLE
    • University of Rochester
    • LLE, Univ. of Rochester
    • Laboratory for Laser Energetics, University of Rochester
    • Lab for Laser Energetics

  • E. M. Campbell

    • University of Rochester, Laboratory for Laser Energetics
    • Laboratory for Laser Energetics
    • University of Rochester
    • LLE, Univ. of Rochester
    • Lab for Laser Energetics

  • D. Cao

    • Laboratory for Laser Energetics, U. of Rochester
    • University of Rochester
    • Lab for Laser Energetics
    • Laboratory for Laser Energetics, University of Rochester

  • Valeri Goncharov

    • Lab for Laser Energetics

  • Varchas Gopalaswamy

    • Lab for Laser Energetics

  • D. Patel

    • University of Rochester
    • Lab for Laser Energetics

  • Sean Regan

    • University of Rochester
    • Laboratory for Laser Energetics - University of Rochester
    • Laboratory for Laser Energetics, U. of Rochester
    • Laboratory for Laser Energetics
    • LLE-UR
    • LLE, Univ. of Rochester
    • Laboratory for Laser Energetics, University of Rochester
    • Lab for Laser Energetics

  • Rahul Shah

    • University of Rochester Laboratory for Laser Energetics
    • Laboratory for Laser Energetics, U. of Rochester
    • Laboratory for Laser Energetics
    • Laboratory for Laser Energetics, University of Rochester
    • Lab for Laser Energetics
    • University of Rochester

  • A. Shvydky

    • Laboratory for Laser Energetics, U. of Rochester
    • Laboratory for Laser Energetics
    • LLE, University of Rochester
    • Lab for Laser Energetics
    • University of Rochester

  • Wolfgang Theobald

    • University of Rochester
    • Lab for Laser Energetics
    • Laboratory for Laser Energetics
    • LLE
    • LLE, Univ. of Rochester
    • Laboratory for Laser Energetics, U. of Rochester
    • Laboratory for Laser Energetics, University of Rochester

  • Dan Clark

    • Lawrence Livermore Natl Lab
    • LLNL

  • Marty Marinak

    • Lawrence Livermore National Laboraotry
    • LLNL

  • Brian Haines

    • Los Alamos National Laboratory
    • Los Alamos Natl Lab
    • LANL